Diagnostic Test

READ AND RECORD DTCS AND ENVIRONMENTAL DATA - ERASE DTCS AND CHECK FOR DTC TO RETURN
1. With the scan tool, read DTCs in all Electronic Control Units (ECU's) and record on the repair order.
2. With the scan tool, run a vehicle Scan Report, or record the Environmental Data related to the DTCs.
3. NOTE: A front door must remain open whenever checking or erasing Radio DTCs.
4. With the scan tool, record and erase the Radio DTCs.
5. Cycle the ignition switch from on to off, wait five seconds and then back to on.
6. Turn the Radio on and set the volume to 25.
7. With the scan tool, read the active Radio DTCs.
  NOTE:
  A front door must remain open whenever checking or erasing Radio DTCs.
  
  Did the DTC return?
  
  Yes
  - Go To Next Step.
  No
  - Perform the appropriate INTERMITTENT CONDITION diagnostic procedure. Refer to: TESTING FOR AN INTERMITTENT CONDITION .
CHECK THE ANTENNA CONNECTION
1. Turn the ignition off.
2. Disconnect the FM2 Diversity Antenna connector at the back of the Radio.
3. Inspect the FM2 Diversity Antenna connections.
  Are the Antenna connections clean and secure?
  
  Yes
  - Go To Next Step.
  No
  - Repair the Antenna connection as needed.
  - Perform the BODY VERIFICATION TEST. Refer to: BODY VERIFICATION TEST .
CHECK THE ANTENNA AND CABLE
1. Connect the special tool # 9977-6-FM, (Antenna) to the antenna connection on the back of the Radio.
2. Make sure one of the front doors is still open.
3. With the scan tool, erase DTCs.
4. Turn the ignition on.
5. Turn the Radio on.
6. With the scan tool, read Radio DTCs.
  Is the DTC active?
  
  Yes
  - Replace the Radio in accordance with the Service Information, refer to: RADIO, REMOVAL AND INSTALLATION .
  - Perform the BODY VERIFICATION TEST. Refer to: BODY VERIFICATION TEST .
  No
  - Go To Next Step.
TEST THE ANTENNA CABLE
1. Disconnect the Antenna cable at the base.
2. Connect the appropriate Adapter: special tool # 9977-6-1 or special tool # 9977-6-3 to the Antenna cable at the back of the Radio.
3. Connect the appropriate Jumper: special tool # 9977-6-4 or special tool # 9977-6-2 to the Antenna cable at the Antenna base.
4. Measure the Resistance across the tool terminals.
  Is the resistance above 52.5 Ohms?
  
  Yes
  - Use the special tool # 9977-6, (Radio Antenna Diagnostic Kit) to locate the open circuit, repair or replace the Antenna cable as necessary.
  - Perform the BODY VERIFICATION TEST. Refer to: BODY VERIFICATION TEST .
  No
  - Replace the Antenna base in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to: BODY VERIFICATION TEST .